Size is the primary difference between a single-DIN and a double-DIN car stereo. A double-DIN stereo is typically twice the height of a single-DIN radio. The DIN refers to a German standardized unit created by the Deutsches Institut für Normung. A single-DIN stereo is generally two inches tall and seven inches wide, while a double-DIN is four inches tall and has the same seven-inch width. Meanwhile, some stereos straddle the line between a single-DIN and a double-DIN. Commonly referred
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